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      <a class="index-header" href="/2019/04/03/Simple-Factory-Pattern/">Simple Factory Pattern</a>

      <a href="/2019/04/03/Simple-Factory-Pattern/" class="index-excerpt">
        
        
          
        
        <div>简单工厂模式结构与实现简单工厂模式结构
Factory(工厂角色) : 工厂角色既工厂类,它是简单工厂模式的核心,负责实现创建所有产品实例的内部逻辑.工厂类还可以被外界直接调用,创建所需的产品对象.在工厂类中提供了静态的工厂方法factoryMethod(),它的返回类型为抽象产品类型Product.
Product(抽象产品角色) : 它是工厂类创建的所有对象的父类,封装了各种产品对象的公有方法</div>
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            <i class="iconfont icon-date"></i>&nbsp;2019-04-03
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              <a href="/tags/Java/">Java</a>
            
              <a href="/tags/Design-Pattern/">Design Pattern</a>
            
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      <a class="index-header" href="/2019/04/02/Spring-%E4%BE%9D%E8%B5%96%E6%B3%A8%E5%85%A5/">Spring 依赖注入</a>

      <a href="/2019/04/02/Spring-%E4%BE%9D%E8%B5%96%E6%B3%A8%E5%85%A5/" class="index-excerpt">
        
        
          
        
        <div>Spring framework 依赖注入篇如果想区分依赖注入与控制反转(IOC)两者之间的不同,可以参考Martin Fowler给出的解释.查看文章: GO

简单来说,依赖注入的情况如下 :
public class A &#123;
    public void importantMethod() &#123;
        B b = ... // get an instance o</div>
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            <i class="iconfont icon-date"></i>&nbsp;2019-04-02
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            <i class="iconfont icon-tags"></i>
            
              <a href="/tags/Spring/">Spring</a>
            
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      <a class="index-header" href="/2019/03/31/%E5%85%A8%E5%9B%BD%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%AD%89%E7%BA%A7%E8%80%83%E8%AF%95-%E4%B8%89%E7%BA%A7%E6%95%B0%E6%8D%AE%E5%BA%93%E6%8A%80%E6%9C%AF/">全国计算机等级考试-三级数据库技术</a>

      <a href="/2019/03/31/%E5%85%A8%E5%9B%BD%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%AD%89%E7%BA%A7%E8%80%83%E8%AF%95-%E4%B8%89%E7%BA%A7%E6%95%B0%E6%8D%AE%E5%BA%93%E6%8A%80%E6%9C%AF/" class="index-excerpt">
        
        
          
        
        <div>NCRE(National Computer Rank Examination) —— 三级数据库技术篇来来来,先欣赏一下昨天去看樱花时拍的风景,语文学的不好的我只能用超级美来形容啦啊哈哈哈 (づ｡◕ᴗᴗ◕｡)づ

哎呦 ~ 要是俺和自己喜欢女孩纸走在这条路上哥哥心里一定美的够够的（づ￣3￣）づ╭❤～

敲黑板：三级数据库技术题目也不难,较二级概念题多一些 ! 勿慌 ✧⁺⸜(●˙▾˙●)⸝⁺✧开门</div>
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          <div class="post-meta mr-3">
            <i class="iconfont icon-date"></i>&nbsp;2019-03-31
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            <i class="iconfont icon-tags"></i>
            
              <a href="/tags/NCRE/">NCRE</a>
            
              <a href="/tags/SQL-Server/">SQL Server</a>
            
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      <a class="index-header" href="/2019/03/31/%E5%85%A8%E5%9B%BD%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%AD%89%E7%BA%A7%E8%80%83%E8%AF%95-%E4%BA%8C%E7%BA%A7MySQL/">全国计算机等级考试-二级MySQL</a>

      <a href="/2019/03/31/%E5%85%A8%E5%9B%BD%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%AD%89%E7%BA%A7%E8%80%83%E8%AF%95-%E4%BA%8C%E7%BA%A7MySQL/" class="index-excerpt">
        
        
          
        
        <div>NCRE(National Computer Rank Examination) —— 二级MySQL篇敲黑板：二级考试的试题都是在往年的试卷中随机抽取的 ! 勿慌 ✧⁺⸜(●˙▾˙●)⸝⁺✧
嘿嘿,没想到你点进来啦,其实我大一报考MySQL二级时并没有记笔记,这就尴尬啦..既然你点击近来啦,那就推荐一波学习资源吧 (っ•̀ω•́)っ✎⁾⁾

我在备考时使用的都是未来教育提供的考试模拟系统,如下图</div>
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            <i class="iconfont icon-date"></i>&nbsp;2019-03-31
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              <a href="/tags/MySQL/">MySQL</a>
            
              <a href="/tags/NCRE/">NCRE</a>
            
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      <a class="index-header" href="/2019/03/31/%E5%85%A8%E5%9B%BD%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%AD%89%E7%BA%A7%E8%80%83%E8%AF%95-%E4%BA%8C%E7%BA%A7C%E8%AF%AD%E8%A8%80/">全国计算机等级考试-二级C语言</a>

      <a href="/2019/03/31/%E5%85%A8%E5%9B%BD%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%AD%89%E7%BA%A7%E8%80%83%E8%AF%95-%E4%BA%8C%E7%BA%A7C%E8%AF%AD%E8%A8%80/" class="index-excerpt">
        
        
          
        
        <div>NCRE(National Computer Rank Examination) —— 二级C篇来来来,先欣赏一下昨天去看樱花时拍的风景,语文学的不好的我只能用超级美来形容啦啊哈哈哈 (づ｡◕ᴗᴗ◕｡)づ


敲黑板：二级考试的试题都是在往年的试卷中随机抽取的 ! 勿慌 ✧⁺⸜(●˙▾˙●)⸝⁺✧
OK ! 说直白一点,二级考试真是的傻白甜,毕竟考试范围都已经给你了,况且还有可能遇到原题呢...但</div>
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            <i class="iconfont icon-date"></i>&nbsp;2019-03-31
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              <a href="/tags/NCRE/">NCRE</a>
            
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      <a class="index-header" href="/2019/03/16/static-keyword/">static keyword</a>

      <a href="/2019/03/16/static-keyword/" class="index-excerpt">
        
        
          
        
        <div>今天刷C语言程序题时遇到很多关于static关键字的题目,为区分Java中的static继而回到寝室写一篇关于Java中static关键字的使用详解.先来谈谈Java中的static"static方法就是没有this的方法.在static方法内部不能调用非静态方法,反过来是可以的.而且可以在没有创建任何对象的前提下,仅仅通过类本身来调用static方法.这实际上正是static方法的主要用途.  </div>
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            <i class="iconfont icon-date"></i>&nbsp;2019-03-16
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              <a href="/tags/Java/">Java</a>
            
              <a href="/tags/JUnit/">JUnit</a>
            
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      <a class="index-header" href="/2019/03/15/%E5%85%A8%E5%9B%BD%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%AD%89%E7%BA%A7%E8%80%83%E8%AF%95-Java/">全国计算机等级考试-Java</a>

      <a href="/2019/03/15/%E5%85%A8%E5%9B%BD%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%AD%89%E7%BA%A7%E8%80%83%E8%AF%95-Java/" class="index-excerpt">
        
        
          
        
        <div>NCRE(National Computer Rank Examination) —— 二级Java篇


敲黑板：二级考试的试题都是在往年的试卷中随机抽取的 ! 勿慌 ✧⁺⸜(●˙▾˙●)⸝⁺✧

选择题总结(重点+易错点)


try与catch的匹配是: catch到的异常是try中可能抛出的异常或其子类的实例.

按照标准的I/O模型,Java提供了三种标准流,分别为：System.in </div>
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          <div class="post-meta mr-3">
            <i class="iconfont icon-date"></i>&nbsp;2019-03-15
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              <a href="/tags/Java/">Java</a>
            
              <a href="/tags/NCRE/">NCRE</a>
            
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      <a class="index-header" href="/2019/03/14/JDBC-%E5%B8%B8%E8%A7%81%E9%94%99%E8%AF%AF%E5%88%86%E6%9E%90/">JDBC 常见错误分析</a>

      <a href="/2019/03/14/JDBC-%E5%B8%B8%E8%A7%81%E9%94%99%E8%AF%AF%E5%88%86%E6%9E%90/" class="index-excerpt">
        
        
          
        
        <div>JDBC ( Java Database Connectivity ) 常见错误分析今遇到一个网友问到JDBC中一个常见的错误,让我想起了大一时自己学习JDBC时整理的文档,继而公布出来分享给大家. 根据不同问题给出相应的解析问题一 : 加载驱动 Class.forName(&quot;com.mysql.jdbc.Driver&quot;);错误
程序报错信息Loading class `com</div>
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          <div class="post-meta mr-3">
            <i class="iconfont icon-date"></i>&nbsp;2019-03-14
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              <a href="/tags/MySQL/">MySQL</a>
            
              <a href="/tags/Java/">Java</a>
            
              <a href="/tags/JDBC/">JDBC</a>
            
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      <a class="index-header" href="/2019/03/12/Ubuntu18-04-Mac-theme/">Ubuntu18.04-Mac theme</a>

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        <div>Ubuntu18.04 桌面美化( Mac theme )小哥哥我特意写了一些注意事项,可以提高效率,避免浪费时间哟 ~
注意 ：千万不要认为在官网下载的包都是一个作用，继而导致后期不按规则存放解压后的包而发生 Tweak 无法识别装饰包的尴尬 !!!

在Ubuntu18.04 中美化桌面分为三个美化部分(装饰包也分为以下三种)

主题美化(Themes)      (/usr/share/th</div>
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          <div class="post-meta mr-3">
            <i class="iconfont icon-date"></i>&nbsp;2019-03-12
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              <a href="/tags/Linux/">Linux</a>
            
              <a href="/tags/Ubuntu/">Ubuntu</a>
            
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      <a class="index-header" href="/2019/03/12/Data-structures-and-algorithm-analysis-in-C/">Data structures and algorithm analysis in C</a>

      <a href="/2019/03/12/Data-structures-and-algorithm-analysis-in-C/" class="index-excerpt">
        
        
          
        
        <div>数据结构与算法分析 - C语言描述著名计算机科学家沃思(Niklaus Wirth)曾提出一个程序公式：程序 = 数据结构 + 算法. 由此体现程序最美的灵魂所在 ~
来! 小哥哥带大家体现一下`灵魂`的美 -(っ•̀ω•́)っ✎⁾⁾-
约瑟夫问题(`Josephus problem `)是循环链表的一个典型应用,其描述如下: M个人围成一个圈,
从其中任意一个人开始,按顺时针使所有人从一开始报数</div>
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          <div class="post-meta mr-3">
            <i class="iconfont icon-date"></i>&nbsp;2019-03-12
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              <a href="/tags/C/">C</a>
            
              <a href="/tags/Data-Structures-and-Algorithms/">Data Structures and Algorithms</a>
            
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